Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a8a490b4bad9b0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d35247c46ccbbf73470ae305d6c75caf SHA-1: 024de642a5fd49fea62356af1258a645f71fe215 SHA-256: c5a8a490b4bad9b02bff8f5b1a950d706277a8846f91ce46208f1255eb6368af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing an image overlay and clickable links to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as the one pointing to 'graveyards-fuj.ae', are likely used to redirect the user to a malicious landing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://graveyards-fuj.ae/userfiles/files/64399344308.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/wokinorofafepibuzonare.pdf
    • https://5703n1n6999-6a55.com/contents/files/dopaperowomuvo.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/8196047868.pdf
    • http://1night2daytour.com/ckupload/files/wiwiwe.pdf
    • http://colafranceschi.it/userfiles/files/61531349793.pdf
    • http://bige.vn/uploads/userfiles/file/82543101448.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55876187728.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8c0e08957e4159d5f6b90f99eb046636/koxatus.pdf
    • https://jobtiara.com/files/files/wusijifoga.pdf
    • https://firsatpin.com/calisma2/files/uploads/kodobifivobepidu.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6acdfcb728fd788e828f1fd83d1df3cb/9627869137.pdf
    • https://butyfarm.mm520.net/userfiles/files/bunagapekowewuwij.pdf
    • http://jinshi66.com/uploadfiles/files/lubepibazajape.pdf
    • http://barudan.hk/UploadFile/file/20210904075704756.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc300367cf---38079757542.pdf
    • http://quangcongluc.com/upload/files/4946064961.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/pujuz.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1496a011---ruwafimitanu.pdf
    • http://stensoproject.com/userfiles/files/32241373449.pdf
    • https://panoramabyty.cz/content/dewugipejil.pdf
    • https://charterfori.ir/basefile/charterforiir/files/dojoxukodetabon.pdf
    • https://mamap.in/ci/userfiles/files/87836325917.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=traffic+rider+all+bikes+unlocked+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae99.bin
30afac95b3b5f0f0dd8cbd0b91ada6ddddd7d6e3c5e87361627352a08d4aefcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 10752 bytes
font_01_sfnt_off0000c778.bin
d242c04030ac2274df2cfb5f49a48b4e94cf5433f202b7d53f2e817fb470b65e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 13996 bytes
font_02_sfnt_off0000e9e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 16792 bytes